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simplify (3n^2+3n+1)^2 - ((3n^2+3n+1)^2 + (6n^2+6n+2)^2 + (6n^2+6n+2)^2)/3
simplify (3n^2+3n+1)^2 - ((3n^2+3n+1)^2 + (6n^2+6n+2)^2 + (6n^2+6n+2)^2)/3
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